RU2087807C1 - Air-conditioning system - Google Patents

Abstract

FIELD: air-conditioning systems. SUBSTANCE: air-conditioning system includes air conditioner with sprinkling chamber and surface heat exchanger which is connected with source of cold made in form of cooling towers by means of pipe lines, valves and pump and with source of heat made in form of hot water pipe line through shut-off valves and controllable electrically-operated valve; system includes also outside air and recirculated air valves operated by means of electric actuating mechanism, supply fan connected with air- distributing humidifying apparatuses. Moisture control is effected by means of moisture content sensor, moisture content regulator and electromagnetic valve which direct water to air- distributing apparatus. System is provided with logic change-over unit which makes it possible to perform the following operations using one temperature sensor and one three-position regulator: to switch on fans of cooling towers, to switch on actuating mechanism of air valves and actuating mechanism of controllable electric valve depending of selected mode of processing the air in air conditioner; mode is selected automatically, thus making it possible to find optimal mode of air processing. EFFECT: enhanced efficiency. 1 dwg

Description

 The invention relates to techniques for air conditioning and is intended to create and maintain in the premises the required air parameters in the working area of the production process.

Known air conditioning system containing apparatus for cooling, heating and humidifying supply air, sources of production of cold and heat, supply and exhaust fans, ducts and automation [1]
This system is the closest to the proposed invention in technical essence. The inability to automatically control the flow of hot water in the heat exchanger leads to an increase in the cost of thermal energy.

 The objective of the invention is the reduction of thermal energy consumption, increasing the accuracy of temperature maintenance.

 The task is achieved by the presence of a logical switching unit, a three-position control device with one temperature sensor.

 The drawing shows a schematic diagram of an air conditioning system. It contains an outdoor air valve 3, an oscillating air valve 4, an air valve 2 for the release of heated air connected by a common draft and driven by an electric actuator 1, then along the processed air there is a filter 5, a heat exchanger 6, an irrigation chamber 7, a supply fan air conditioner 8, air distribution and humidification device 9, exhaust fan 10.

 For cooling water used in the heat exchanger and irrigation chamber 7, the system has a pump 20, shut-off valves 17, 18, cooling towers 11, 12 with fans 13, 14, and pump 21 is used to circulate water in the irrigation chamber, in the case of using heat exchanger 6 for heating air use an electromotor control valve 16 and shut-off valves 15 and 19, to automatically maintain the temperature in room 22, a temperature sensor system 23, a three-position control device 24, a logical switching unit 29, switch Teli modes 28 and warning lights 30, 31, 32, 33, 34, to maintain humidity jobs system has a humidity sensor, humidity regulator 26 and solenoid operated valve 27.

 The air conditioning system works as follows: depending on the outdoor temperature, the logical switching unit selects the processing mode of the air in the air conditioner. The following modes are possible: cooling mode, recirculation mode and heating mode.

 1. Cooling mode.

 The fresh air intake valve 3 is fully open, a signal is sent to the logical switching unit 29 from the limit switch block KV of the electric design of mechanism 1, which turns the system on in the “cooling” mode, and the signal lamp 30 “Cooling mode” lights up. The recirculation air valve 4 is completely closed, all the air from the workshop is discharged into the street through the air valve 2. The temperature sensor 23, installed at the "characteristic" point in the workshop, is connected to the three-position control device 24 located in the control panel. When the temperature readings are between the limits “more” and “less”, the pump 20 is turned on, which supplies water to the cooling towers 11 and 12 installed on the street and the fan 13 of one of the cooling towers. When the limit is “greater”, the fan 14 of the second tower is turned on. In this case, the water, cooling in the cooling towers due to the evaporative effect, enters the pan of the irrigation chamber 7, from where it is pumped 21 to the nozzles of the irrigation chamber, and then pump 20 through the heat exchanger 6 again to the cooling towers. The cooling of the outside air takes place sequentially in the heat exchanger 6 and the irrigation chamber 7. If the temperature in the workshop has fallen below the “more” limit, the fan of one tower is turned off.

 2. The recirculation mode.

 When the temperature in the workshop drops below the “less” limit, a signal is sent from the device 24 to the logical switching unit 29, which gives the command to switch the system to the “Air recirculation” mode, the signal lamp 31 “Air recirculation” lights up, both cooling tower fans and the pump 20 turn off , the three-position device 24 is transferred to work with the electric actuator 2 of the air valves 2, 3, 4.

 When the temperature in the workshop below the "less" limit, the actuator 1 is turned on, while the blades 2, 3, 4 are rotated so that for cold air it decreases and the recirculation air increases. The rotation of the blades occurs until the readings of the device 24 are between the limits of regulation.

 In order to avoid temperature overshoot, the logical switching unit turns on the actuator for a certain time, then there is a pause, after which the result of exposure to the air valves can be recorded by the device 24; if the result is not achieved, the next dose of exposure should be given. When the temperature in the workshop increases above the "less" limit, the signal to the actuator 1 stops. When the temperature rises further, for some reason above the "more" limit, an intermittent signal is again sent to the actuator, but in this case its effect is directed to another side, i.e. the proportion of cold air from the street increases, and the recirculation air decreases until the temperature in the workshop decreases below the “more” limit.

 If the outdoor air valve is completely open, as indicated by the block of limit switches KV of the actuator 1 to the logical switching unit 29, and from the device 24 a signal is received that the temperature in the workshop is higher than the limit, then the logical switching unit 29 will give a command to switch to cooling mode, i.e. work with cooling towers. In this case, the pump 20 for supplying water to the cooling towers and fans of both cooling towers automatically turns on.

 The transition from recirculation mode to cooling mode and vice versa occurs automatically.

 3. Heating mode.

 With a decrease in outdoor air temperature or a decrease in heat transfer in the workshop, the possibility of controlling the air valves can be exhausted, the outdoor air valve will be completely closed, which will be signaled from the KV limit switch block of the actuator 1 to the logical switching unit 29. In turn, block 29 will issue the command to switch to heating mode (winter mode) lights up signal lamp 32 "Regulation limit has been reached, switch to heating mode".

 To switch to the heating mode, it is necessary to drain the water from the cooling towers and the heat exchanger, close the cold water valves 17, 18, which disconnect the heat exchangers and cooling towers from the cold water supply.

 Open the hot water valves 15, 35. Set the mode switch 28 to the "Heating mode" position. In this position, the temperature sensor 23 and the device 24 through the logical switching unit 29 will control not the air valves, but the control electromotor valve 16 standing on the hot water pipe entering the heat exchanger.

 This valve is controlled by an electric actuator similar to one controlling the air valves. When the temperature in the workshop is less than the limit “less”, the device 24 sends a corresponding signal to the block 29, which in turn gives a command in the form of intermittent action on the actuator of the valve 16, as in the case of air valves. The valve 16 opens smoothly, increasing the flow of water through the heat exchanger 6 and the air entering the workshop heats up more. The valve opens until the temperature in the workshop exceeds the “less” limit. As the temperature in the workshop rises above the “greater” limit, valve 16 will begin to reduce the amount of water entering the heat exchanger.

 In order to prevent freezing of the heat exchanger, it is recommended to open the bypass valve 15 to pass the guaranteed part of the hot water.

 If the control valve 16 turns out to be fully open, a signal from the “Limit of control upper limit” signal lamp 33 will light up at the signal from the KV limit switch block of the valve actuator 16. In this case, it is necessary to check the pressure and temperature of the hot water at the inlet to the air heater.

 If the control valve 16 is completely closed, and the temperature in the workshop is above the “greater” limit, the signal lamp 34 “Lower control limit” lights up. This means that you must switch to air recirculation mode. In order to avoid freezing of the heat exchanger, the transition to this mode is carried out manually by turning the mode switch 28. At the same time, water from the heaters must be drained.

Claims (1)

 An air conditioning system comprising apparatus for cooling, heating and humidifying supply air, sources of cold and heat production, supply and exhaust fans, ducts and automation equipment, characterized in that the apparatus is made in the form of surface heat exchangers connected by pipelines and a pump to cooling towers and through shut-off valves and a controlled electromotor valve to a heat source in the form of hot water pipelines, controlled by an electric actuator valves of external and recirculation air, while the supply fan is connected to air distribution humidifiers, the air humidity after which is controlled by a humidity sensor, humidity controller and a valve with an electromagnetic actuator that passes water into the air distribution device, and the system is equipped with a logical switching unit, allowing, using one temperature sensor and one three-position control device, control the inclusion of cooling tower fans, executive m by the mechanism of air valves and the actuator of an adjustable electromotor valve in hot water, depending on the selected mode of air treatment in the system.